| Hackney UK Holdings Ltd | Real estate | 2025 |
| Hackney UK Investment Limited | Real estate | 2024 |
| Hackthorne Property Services Ltd | Real estate | 2022 |
| Hacktonics Ltd | Information & communication | 2023 |
| Hadden Consulting Limited | Other services | 2016 |
| Haddonhall Consultancy Ltd | Professional & scientific | 2011 |
| Hadia&Abdullah Ltd | Wholesale & retail | 2026 |
| Hadish Engineering Limited | Professional & scientific | 2008 |
| Hadley Design Services Limited | Professional & scientific | 2023 |
| Haedus Solar Limited | Energy | 2021 |
| Hafid Limited | Other services | 2014 |
| HAG Shutters & Grilles Group Ltd. | Financial services | 2002 |
| HAG UK Ltd. | Extraterritorial | 2012 |
| Hagen & Co. Limited | Professional & scientific | 1990 |
| Hager Homes Ltd | Real estate | 2026 |
| Hagerty Digital Ltd | Information & communication | 2019 |
| Haho Ltd | Real estate | 2017 |
| Haiku Apparel Limited | Wholesale & retail | 2020 |
| Hailes Abbey Joinery Limited | Manufacturing | 2010 |
| Hailstone Farm Parking Limited | Real estate | 2024 |
| Hain Group Limited | Construction | 2011 |
| Hair @ 56 Ltd | Other services | 2015 |
| Hair and Beauty Boutique Ltd | Other services | 2019 |
| Hair and Beauty Station Ltd | Wholesale & retail | 2018 |
| Hair at 54 Limited | Other services | 2026 |
| Hair at 58 Limited | Other services | 2009 |
| Hair at the Potting Shed Limited | Other services | 2026 |
| Hair by Knight Ltd | Other services | 2023 |
| Hair Culture Studio Limited | Other services | 2025 |
| Hair Necessity Ltd | Professional & scientific | 2014 |
| Hair Sanctuary Limited | Other services | 2025 |
| Hair Solved Bristol Limited | Other services | 2014 |
| Hair Storm Ltd | Other services | 2024 |
| Hair Transformations Ltd | Other services | 2023 |
| HAIR4ALL.COM (London) Ltd | Health & social care | 2019 |
| Hairbylara Limited | Wholesale & retail | 2024 |
| Hairr Pro Limited | Wholesale & retail | 2024 |
| Hairtechnic Ltd | Wholesale & retail | 2008 |
| Hairticians Hair & Beauty Ltd | Other services | 2024 |
| Hairwizard Limited | Other services | 2003 |
| Hairy Jayne Ltd. | Manufacturing | 2011 |
| Haizelden Oils Ltd. | Other services | 2025 |
| HAJ Services Limited | Real estate | 2022 |
| HAK Holdings 1 Limited | Real estate | 2021 |
| HAK Holdings 2 Limited | Real estate | 2022 |
| HAK Holdings 3 Limited | Real estate | 2022 |
| HAK Holdings Topco Limited | Real estate | 2021 |
| HAK Property (SW) Limited | Real estate | 2023 |
| Hakam Trading Ltd | Transport & logistics | 2016 |
| Hakuk Limited | Health & social care | 2021 |
| Hakuna Food Ltd | Hospitality | 2025 |
| Hakx Limited | Information & communication | 2025 |
| Hal-Capital Limited | Professional & scientific | 2024 |
| Halberd Property Ltd | Real estate | 2024 |
| Halbrow Ltd | Real estate | 2024 |
| Halcyan Ltd | Professional & scientific | 2015 |
| Halcyon Home Designs Limited | Wholesale & retail | 2012 |
| Halcyon Mastering Limited | Arts & recreation | 2022 |
| Halcyon Media Limited | Professional & scientific | 2001 |
| Halcyon Newbuild Limited | Construction | 2013 |
| Haldor Limited | Construction | 2014 |
| Hale Marketing Consultants Limited | Construction | 2015 |
| Hale Properties Limited | Real estate | 2014 |
| Halebray Limited | Wholesale & retail | 2018 |
| Hales & Hales Limited | Real estate | 2021 |
| Hales Intelligence Ltd | Professional & scientific | 2024 |
| Half Light Projects C.I.C. | Arts & recreation | 2025 |
| Half-Causation Limited | Professional & scientific | 2020 |
| Halford Holdings Limited | Financial services | 2026 |
| Halfpint Theatre Limited | Arts & recreation | 2013 |
| Haliden Oriental Carpets Limited | Wholesale & retail | 2021 |
| Haligi Limited | Professional & scientific | 2023 |
| Haligu Limited | Real estate | 2021 |
| Halistrom Limited | Professional & scientific | 2025 |
| Halkyn Student Living Limited | Real estate | 2024 |
| Hall Cedar Hall (Management) Company Limited(The) | Households | 1984 |
| Hall Place Veterinary Centre Limited | Extraterritorial | 2009 |
| Hall Properties SW Ltd | Real estate | 2025 |
| Hall Property Services Limited | Construction | 2008 |
| Hall, Walker, Robertshaw Limited | | 1988 |
| Hallam Consultancy Ltd | Professional & scientific | 2019 |
| Hallamtech Ltd | Wholesale & retail | 2023 |
| Hallards Limited | Real estate | 1995 |
| Hallcroft Associates Limited | Real estate | 2017 |
| Hallen AFC Sports Court Ltd | Arts & recreation | 2018 |
| Hallen Developments ( Bristol ) Ltd | Real estate | 2018 |
| Hallen Developments ( South West ) Ltd | Real estate | 2020 |
| Hallen Farm Management Company Limited | Households | 2020 |
| Hallen Industrial Estate Limited | Real estate | 2014 |
| Hallend Residents Ltd. | Real estate | 1997 |
| Hallett Construction Ltd | Construction | 2019 |
| Hallett Design and Build Limited | Construction | 2016 |
| Hallett Housing Ltd | Real estate | 2023 |
| Hallett Loft Conversions Ltd | Construction | 2021 |
| Hallett Logistics Ltd | Transport & logistics | 2015 |
| Halletts Way Ltd | Construction | 2023 |
| Halleys (UK) Limited | Construction | 2011 |
| Hallmark (Bristol) Limited | Health & social care | 2019 |
| Hallmark Building Solutions Limited | Construction | 2010 |
| Hallowed Care Limited | Health & social care | 2023 |